May 16, 2024
To: President Carrie Hartman and members of City Council
Through: Wade Kapszukiewicz, Mayor
Karen Poore, Deputy Chief of Staff
From: Michael C. Troendle, Chief of Police
Subject: Referral #080-24, dated May 3, 2024
REFERRAL:
Error Rate, Efficacy and Benefits of Shot Spotter
Failures of Technology
RESPONSE:
Please see attached document for the following ShotSpotter stats for the last year (May 2023-end of April 2024):
* Detection Summary
o Total Detections Reviewed- Total number of ShotSpotter detections reviewed by ShotSpotter
o Total Detections Published- Total number of ShotSpotter detections that officers were dispatched
o Total Detections Dismissed- Total number of ShotSpotter detections that were dismissed for various reasons ranging from fireworks, construction sounds, to other non-gunfire sounds.
* Gunfire Incident Details
o Single Gunshot
o Multiple Gunshots
o Probable Gunshots
* Agency/Customer Reported Issues- These were errors that were reported by TPD to ShotSpotter
o Reported False Positive Incidents- Incidents that were reported as gunfire and turned out to be non-gunfire related
o Reported False Negative Incidents- Incidents that were not reported to be gunfire but ended up being gunfire related
o Reported Missed Incidents- Incidents that didn't get picked up by ShotSpotter but evidence of gunfire was found/reported to 911.
o Reported Duplicate Incidents
o Reported Mislocated Incidents- Incidents that occurred and dispatched but location was incorrect.
* Publication Time Metric
o # of Published Incidents Under 60 Seconds- ShotSpotter incidents pushed to dispatch in under 60 seconds.
o # of Published Incidents Over 60 Seconds- ShotSpotter incidents pushed to dispatch later than 60 seconds.
Shotspotter benefits:
* Enables rapid response to gunfire, 80% of which is not reported to 9-1-1
* Over 90% of Shotspotter calls dispatched in less than 60 seconds
* Display gunshot locations on maps in real-time
* Gunshot crime ...
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